41 259 
viously known only from Ceylon where Leuduger-Fortmore] 
has found it in a sample ,recueillie . ... sur l’ancre d’un navire 
mouillé, par huit brasses d’eau, & Colombo, sur les cétes de 
Ceylan*. Certainly there is nothing to prevent that, at Colombo 
it might have been carried out into the sea with freshwater; 
however the whole habit of this species does not at all agree with 
Achnantheae from freshwater, but much more with marine forms 
such as Ach. brevipes. Perhaps the examination of the marine 
Diatoms collected by the Danish Expedition will prove that it also 
occurs in the Gulf of Siam, but its presence in elevated inland 
waterfalls is nevertheless very strange. 
As to the general’ character of the flora so far as we can 
judge from the present samples of freshwater Diatoms, we must 
say that it is less pronounced by the present than by the wanting 
forms. Most of the species observed occur scattered round the 
world, a few have previously been recorded only from more adja- 
cent localities e. g. Navicula Stodderi (Bengal), Stauroneis anceps 
hyalina (Australia), Cymbella japonica (Japan), Funotia major octo- 
undulata (Banca), Desmogonium Rabenhorstianum (Banca and China), 
Denticula Van Heurckii (Japan) but none of those species occurs 
in such a quantity that it might be said to characterize the collec- 
tion in its entirety. The following genera are however either very 
sparingly represented or they occur in not typical species: Cymbedla, 
Epithemia, Cyclotella, Surirella, Fragilaria, Denticula and wanting 
are: Pleurosigma, Rhoicosphenia, Cymatopleura, Tabellaria, Diatoma, 
Meridion, Melosira. 
